b)
[tex]y = |AB| \times \sqrt{2} \: \: \: \: \: \: \: | \div \sqrt{2} \\ |AB| = \frac{y}{ \sqrt{2} } = \frac{y}{ \sqrt{2} } \times \frac{ \sqrt{2} }{ \sqrt{2} } = \frac{ \sqrt{2 \:} y}{2} [/tex]
c)
[tex]|AC| = \sqrt{3} z \times \sqrt{2} = \sqrt{6} z[/tex]